javax.swing.JList#isSelectionEmpty ( )源码实例Demo

private void removeSelected(JList list, String prefKey) {
    DefaultListModel m = (DefaultListModel)list.getModel();
    while (!list.isSelectionEmpty()) {
        m.remove(list.getSelectionModel().getLeadSelectionIndex());
    }
    updatePreference(list, prefKey);
}
 

/** Configures a list cell renderer and sets up sizing and the 
 * backing image from it */
public boolean configure (Object nd, JScrollPane tv, JList list, int row) {
    boolean sameVn = setLastRendereredObject(nd);
    boolean sameComp = setLastRenderedScrollPane (tv);
    Component renderer = null;
    bg = list.getBackground();
    boolean sel = list.isSelectionEmpty() ? false :
        list.getSelectionModel().isSelectedIndex(row);
    renderer = list.getCellRenderer().getListCellRendererComponent(list, nd, row, sel, false);
    if (renderer != null) {
        setComponent (renderer, list);
    }
    return true;
}
 

private Configurable getSelectedValue() {

		if (!localConfigList.isSelectionEmpty()) {
			return localConfigList.getSelectedValue();
		} else {
			for (JList<Configurable> list : remoteConfigLists.values()) {
				if (!list.isSelectionEmpty()) {
					return list.getSelectedValue();
				}
			}
		}
		return null;
	}
 

/**
 * Shows a .tex files list from user's dropbox and opens the selected one
 *
 * @return List, that contatins user's .tex files from his dropbox; can be
 * empty
 */
public void openFromDropbox(DropboxRevisionsTopComponent drtc, RevisionDisplayTopComponent revtc) {
    List<DbxEntryDto> dbxEntries = getDbxTexEntries(DbxUtil.getDbxClient());

    if (!dbxEntries.isEmpty()) {
        JList<DbxEntryDto> list = new JList(dbxEntries.toArray());
        list.setSelectionMode(DefaultListSelectionModel.SINGLE_SELECTION);
        int option = JOptionPane.showConfirmDialog(null, list, "Open file from Dropbox", JOptionPane.OK_CANCEL_OPTION);

        if (option == JOptionPane.OK_OPTION && !list.isSelectionEmpty()) {
            DbxEntryDto entry = list.getSelectedValue();
            String localPath = ApplicationUtils.getAppDirectory() + File.separator + entry.getName();
            File outputFile = DbxUtil.downloadRemoteFile(entry, localPath);

            revtc.close();

            drtc.updateRevisionsList(entry.getPath());
            drtc.open();
            drtc.requestActive();

            String content = FileService.readFromFile(outputFile.getAbsolutePath());
            etc.setEditorContent(content);
            etc.setCurrentFile(outputFile);
            etc.getEditorState().setDbxState(new DbxState(entry.getPath(), entry.getRevision()));
            etc.getEditorState().setModified(false);
            etc.getEditorState().setPreviewDisplayed(false);
        }
    } else{
        JOptionPane.showMessageDialog(etc, "No .tex files found!", "Error", JOptionPane.ERROR_MESSAGE);
    }
}
 

@Override
public void valueChanged(ListSelectionEvent lse) {
    JList lst = (JList)lse.getSource();
    boolean sel = lst.isEnabled() && !lst.isSelectionEmpty();
    btnRemoveGeneric.setEnabled(sel);
}